What each state and Washington DC requires to remediate mold, to assess or test for it, and whether one company may do both. Every answer cites the statute, rule or regulator it comes from, so you can check it yourself.
Most states have no license for mold remediation. Florida, Louisiana, New York, Texas and Washington DC issue a license specifically for mold work, and Connecticut, Mississippi, Tennessee and Virginia cover mold remediation with another state credential. Illinois has a registration law that is not in effect yet, and we found no state credential that names mold remediation in the other 41 states.
Colorado has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Work standards
After notice of mold associated with dampness in a rental home, a landlord must install containment, stop active water sources and set up HEPA air filtration within 72 hours, then dry affected materials, decontaminate or remove damaged materials, and evaluate the work, including post-remediation testing for mold.
Connecticut's home improvement contractor registration covers mold remediation on homes and residential rental properties.
Conn. Gen. Stat. §§ 20-419, 20-420
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Work standards
From October 1, 2026, contractors must perform mold remediation to the ANSI/IICRC S520 standard, fourth edition, or a successor revision the Commissioner of Consumer Protection approves.
The District requires a license to remediate mold for pay in residential property where indoor mold growth covers 10 square feet or more, with other exemptions set out in its rules.
Licensees must disclose any known or potential conflict of interest, may not assess or remediate property they or their company have a financial interest in, and may not pay or accept referral fees. No rule bars one company from doing both on the same property.
20 DCMR 3204.4(c), 3204.5
Other rules
Work standards
After a tenant's notice of mold, a residential property owner must inspect within 7 days and remediate within 30 days of the inspection, using a licensed mold remediation professional at or above the District's 10-square-foot threshold. Since June 12, 2026 the Department of Buildings, not the Department of Energy and Environment, handles mold complaints in rental housing.
Florida also requires a mold assessor license for mold assessment covering more than 10 square feet.
Fla. Stat. §§ 468.8411, 468.8419
Assessing and remediating the same job
Not allowed within a set period
A mold assessor may not remediate a building that the assessor or the assessor's company assessed in the last 12 months, and a mold remediator may not assess a building it remediated in that time. State-certified general, building and residential contractors are exempt.
Kentucky has no mold remediation license, but state law sets standards that every company paid to do mold remediation must follow.
Mold assessment
None found
Kentucky has no mold assessment credential: its rules define an indoor environmental professional by training, education and experience, and the state form given to customers says no state rules certify them.
40 KAR 2:330 § 1(2); Form MRC-2
Assessing and remediating the same job
Limited rule
Any sampling to verify a finished remediation must be done by an independent indoor environmental professional paid directly by the customer, and before signing, customers must receive a state form saying that professional should not be paid by the remediation company.
40 KAR 2:330 §§ 2(7)(d), 3(1)(b)5.d, 3(4)
Other rules
Work standards
Paid mold remediation must follow state minimum standards based on the principles of IICRC S520, including written containment decisions, protective equipment, a written assessment and remediation plan and contract, and a post-remediation report.
KRS 367.83805; 40 KAR 2:330
Pesticide rule
Pesticide applicators must be certified in a category that matches the work, and the antimicrobial category covers applying pesticides to control mold.
A mold remediation contractor may not perform both mold assessment and mold remediation on the same property, or own an interest in both the assessment company and the remediation company on the same property.
Maine has no state license, registration or certification for mold remediation, though a company doing both mold assessment and remediation on one project must give the owner a signed disclosure.
Mold assessment
None found
Assessing and remediating the same job
Disclosure required
A person or company providing both mold assessment and mold remediation on a building project must first give the owner a signed disclosure statement about the potential conflict of interest.
10 M.R.S. § 1480
Other rules
Pesticide rule
Using any pesticide as a paid service needs a commercial applicator license from the Board of Pesticides Control, which names mold remediation as an example.
Maryland has no mold remediation license, because its 2008 licensing law was never put into practice and ended in 2019.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Work standards
Landlords must carry out a mold assessment within 15 days of written notice of mold and, if mold is found, remediate within 45 days of the assessment where feasible. Statewide mold assessment and remediation standards are due by June 1, 2027.
Minnesota has no mold-specific license, though a company that applies pesticides for pay, including for indoor mold, needs a state pesticide applicator license.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Pesticide rule
Applying pesticides for pay needs a commercial pesticide applicator license, and the Department of Agriculture has a license category for antimicrobial pesticides used in indoor mold mitigation and remediation.
Nebraska has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Pesticide rule
Paid pesticide applications in the Department of Agriculture's wood-destroying organisms category, which lists mold as an example, need a commercial applicator license.
Nevada has no state license, registration or certification for mold remediation.
Mold assessment
None found
Nevada has no mold assessment credential, and its rules bar certified home inspectors, while making an inspection, from determining whether mold is present unless they are licensed or certified to do so.
New Jersey has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Work standards
In buildings occupied by public employees, the employer must promptly repair water intrusion, dry, replace, remove or clean damp materials within 48 hours of discovery, and remove visible microbial contamination.
New York also licenses mold assessment contractors for the same projects.
N.Y. Labor Law § 931
Assessing and remediating the same job
Not allowed
No licensee may perform both mold assessment and mold remediation on the same property, and no one may own an interest in both the assessment licensee and the remediation licensee on the same property.
N.Y. Labor Law § 936(2)-(3)
Other rules
Work standards
The assessor writes a remediation plan before work begins, the remediator writes a work plan that carries it out, and the assessor checks the finished work and issues a written clearance report if it passes.
Oklahoma has no state license, registration or certification for mold remediation, though state law limits one company from both inspecting for and removing mold.
Mold assessment
None found
Assessing and remediating the same job
Not allowed
Whoever inspects a house for mold may not also remove it, unless the combined cost is $200 or less and the consumer agrees.
The Tennessee Board for Licensing Contractors has a Mold Remediation (S-F) contractor classification.
Tenn. Comp. R. & Regs. 0680-01-.16
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Pesticide rule
The Department of Agriculture's Mold Remediation license is required for anyone who supervises paid pesticide applications to control mold and fungus in buildings.
Texas requires a state license to remediate mold, except where the mold covers less than 25 contiguous square feet, with other exemptions set out in the statute.
Texas licenses mold assessment separately under the same law.
Tex. Occ. Code § 1958.101
Assessing and remediating the same job
Not allowed
A license holder may not both assess and remediate the same project, and no one may own an interest in both the assessment company and the remediation company on the same project. School district employees working on district projects are exempt.
Tex. Occ. Code § 1958.155
Other rules
Work standards
The assessor prepares a work analysis and the remediator a work plan before work begins, the state is notified at least 5 days before remediation starts except in an emergency, and within 10 days of finishing the owner receives a certificate of mold remediation with a licensed assessor's statement that the mold was remediated.
Vermont has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Pesticide rule
A business that applies a pesticide in someone else's home needs a company license, and the Agency of Agriculture, Food and Markets certifies applicators who treat mold.
Vt. Rule for Control of Pesticides §§ 3.01(a), 9.02(g)(6)
Virginia bars selling residential mold remediation services without a mold remediation certification from a nationally or internationally recognized certifying body.
Va. Code § 59.1-200(A)(81)
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Work standards
The same provision names the EPA's Mold Remediation in Schools and Commercial Buildings, the ANSI/IICRC S520 standard or another equivalent ANSI-accredited standard as the ones to follow.
Wisconsin has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
Pesticide rule
The Department of Agriculture, Trade and Consumer Protection says a company using products labeled to kill or control mold needs a pesticide business license and certified, licensed applicators. Products labeled only as disinfectants, sanitizers or germicides are exempt.
Wyoming has no state license, registration or certification for mold remediation.
Mold assessment
None found
Assessing and remediating the same job
None found
Other rules
None found
Definitions
How to read the table
Mold remediation and Mold assessment show the state credential we found whose law, rule or regulator names that work. A general contractor license that never mentions mold is not counted, though it may still apply to the repairs; each state's page covers that. Industry certifications that no state law requires are not counted either. Our guide to mold certifications explains which ones matter when you hire.
Assessing and remediating the same job shows whether a rule that names mold bans, delays or requires disclosure when one company both assesses the mold and remediates it. Rules that bar home inspectors from repairing what they inspected are not counted when they do not name mold.
Other rules lists laws that set how mold work must be done and pesticide rules that name mold.
None found means we searched the state's statutes, administrative code and regulator pages and found no such provision on the review date. It is a research finding, not a legal opinion.
Labels and CSV codes
State license license
A license issued specifically for mold work.
Contractor classification classification
A contractor license category that names mold remediation. Whether a job needs it depends on the job.
State registration registration
A contractor registration that names mold remediation.
Certification required certification
The law requires a certification from an outside certifying body. The state issues none itself.
Not in effect yet pending
The law has passed, but its requirements wait on rules.
Not allowed ban
One company may not do both, apart from any exception the row notes.
Not allowed within a set period lookback
One company may not do both within a set time.
Disclosure required disclosure
Doing both is allowed after a conflict-of-interest disclosure.
Limited rule limited
A narrower rule, explained in the row.
None found none, none-found
No such provision found on the review date.
Pesticide licenses
A pesticide license is not a mold license
Some states require a pesticide license to apply antimicrobial or fungicide products for pay. In at least 7 states, the pesticide rules or the pesticide regulator name mold: Kentucky, Maine, Minnesota, Nebraska, Tennessee, Vermont and Wisconsin. Each one is noted in the table. That license covers the products a company applies, not how the mold remediation is done.
We did not read every state's pesticide rules, so a state missing from that list may still require a pesticide license. If a company plans to spray or fog a product on mold, ask which license covers it.
Laws that are changing
What changes next
Laws already passed and rules already in formal review. Bills that have not passed are left out until they become law.
Connecticut
From October 1, 2026, a contractor that does mold remediation is registered only if it attests to a mold remediation certification from IICRC, NORMI or another organization the Department of Consumer Protection approves, and the work must follow ANSI/IICRC S520.
The Department of Public Health's rules to put the Mold Remediation Registration Act into effect were before the legislature's rules committee in September 2026. Until they are adopted, there is no registration to check.
Every answer was checked against primary sources: the legislature's statute text, the state's administrative code, session laws, or the regulator's own website. Law firm summaries, trade groups and other license-by-state lists were used only as leads, because several of them repeated facts the primary sources did not support.
Every row was last reviewed on September 16, 2026. Laws change, so check that date and the cited source before you rely on an answer.
This page summarizes state law. It is not legal advice. If a decision depends on the law, read the cited provision or ask a lawyer licensed in that state.
Found an answer that is out of date? Send the state and the source through our contact page.
Reuse this data
The Verified Remediation Mold Law Survey is published under Creative Commons Attribution 4.0 (CC BY 4.0). You may copy, adapt and republish it, including commercially, if you credit Verified Remediation, link to this page and the license, and note any changes.
Suggested credit
Verified Remediation Mold Law Survey, reviewed September 16, 2026. www.verifiedremediation.com/mold-licensing-by-state
Do mold remediation companies need to be licensed?
In most states there is no license specifically for mold remediation, though a general contractor license can still apply to the repair work. Florida, Louisiana, New York, Texas and Washington DC issue a license specifically for mold remediation. Connecticut, Mississippi, Tennessee and Virginia cover it with another state credential: a contractor classification in Mississippi and Tennessee, a registration in Connecticut and a required certification in Virginia. Illinois has a mold remediation registration law that is not in effect yet. We found no state credential that names mold remediation in the other 41 states.
Do you need a license to test for mold?
In most states, no. Florida, New York, Texas and Washington DC license mold assessment. New Hampshire requires anyone paid mainly to assess mold in a home to hold a national third-party certification. We found no state credential for mold assessment in the other 46.
Can the same company test for mold and do the remediation?
It depends on the state. Louisiana, New York, Oklahoma and Texas do not allow it, apart from the narrow exceptions noted in the table. Florida does not allow it within 12 months of the first job. Maine and Washington DC require a conflict-of-interest disclosure instead. Kentucky requires any sampling that verifies a finished remediation to be done by an independent professional paid by the customer. We found no rule that names mold in the other 43. Where no rule applies, an assessor who does not do the remediation is still the stronger check.
Is a pesticide license the same as a mold remediation license?
No. Some states require a pesticide license to apply antimicrobial or fungicide products for pay, and in at least 7 states the pesticide rules or regulator name mold: Kentucky, Maine, Minnesota, Nebraska, Tennessee, Vermont and Wisconsin. That license covers the products, not how the mold remediation is done. We did not check every state's pesticide rules, so others may require one too.
Is this survey legal advice?
No. It is a research summary of state law with a source for every answer, reviewed on September 16, 2026. Read the cited provision before you rely on an answer, and ask a lawyer licensed in the state if a decision depends on it.
Can I reuse this data?
Yes. The survey is published under CC BY 4.0: credit Verified Remediation, link to this page and the license, and note any changes you make. The full table is available as a CSV download.
Checking a company, not a state?
A state credential is one check. The others are insurance you confirm with the carrier, a written scope of work, and an assessor who does not do the remediation.